linux-kernel - Re: [PATCH] nfsd: Fix a memory leak in an error handling path

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Date:   Fri, 26 Aug 2022 06:41:16 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Chuck Lever <chuck.lever@...cle.com>,
        "J. Bruce Fields" <bfields@...hat.com>,
        Scott Mayhew <smayhew@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-nfs@...r.kernel.org
Subject: Re: [PATCH] nfsd: Fix a memory leak in an error handling path

On Fri, 2022-08-26 at 12:24 +0200, Christophe JAILLET wrote:
> If this memdup_user() call fails, the memory allocated in a previous call
> a few lines above should be freed. Otherwise it leaks.
> 
> Fixes: 6ee95d1c8991 ("nfsd: add support for upcall version 2")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Speculative, untested.
> ---
>  fs/nfsd/nfs4recover.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
> index b29d27eaa8a6..248ff9f4141c 100644
> --- a/fs/nfsd/nfs4recover.c
> +++ b/fs/nfsd/nfs4recover.c
> @@ -815,8 +815,10 @@ __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
>  				princhash.data = memdup_user(
>  						&ci->cc_princhash.cp_data,
>  						princhashlen);
> -				if (IS_ERR_OR_NULL(princhash.data))
> +				if (IS_ERR_OR_NULL(princhash.data)) {
> +					kfree(name.data);
>  					return -EFAULT;
> +				}
>  				princhash.len = princhashlen;
>  			} else
>  				princhash.len = 0;

Reviewed-by: Jeff Layton <jlayton@...nel.org>